Im not using KC but I must agree with LBurst... It took me a good 6-8 months of practice, learning, configuring, practice, and more practice, till I got a method that works for ME! and thats really the "magic" about it. Find what works for you.

I use ISBoxer. ( I do not get paid to use it, or am I affiliated with it<--legal disclaimer) However if you havent tried it, I encourage you to dl the free 7 day trial and give it a whirl with just using 5 accounts or something small. Get a grip on how to use any software you choose, and then open it up to more accounts. going at 28 accounts from the opening gate, (to me) seems like a recipe for doom and failure.

Get the hang of two accounts, then go for 5, then 10, then 15, or the full amt. Once you have things under control, experiment with other addons that can assist you...

Example: ask yourself a question, and answer it... "How can I heal one guy, or select just one guy from my master window, without using the healer as the main?" Answer (for me) Gridcustomlayout, and a repeater region, plus mouseover macros.

^There are other methods too... but this one I like, and works well for me.